By the way, about the uneven color temperature of the screen, there is a way to objectively verify the uniformity, I did it with the iPad and this allows you to quickly assess the degree.
All that is needed is a normal mirrorless or SLR camera, Able to shoot in RAW (the phone will not work, the color depth is too low).
We open the page in Safari with the keyboard, photograph the screen in a dark room, set up the settings so that the screen is not very bright on the photo.
The resulting RAW-photo open in Photoshop and move the slider "Saturation" ("Saturation") to the extreme right position. We get a color temperature map. It cannot be absolutely uniform, but there should be no “kinks,” when one area of ​​the screen is strongly red and the other is strongly blue.
When choosing an iPad, I tried many copies, here’s my color map, which I consider to be ideal (it’s impossible to see the difference in color temperature), that is, this result can be considered ideal:
Post has been editedeXodusN - 26.09.16, 16:27